John Rambo is released from prison by the government for a top-secret covert mission to the last place on Earth he'd want to return - the jungles of Vietnam.
After some violent confrontations with his new classmates, Daniel LaRusso learns karate from Japanese handyman Mr. Miyagi, in order to defend himself.
A disturbed gang of youths kidnap, torture and murder two teenage girls; unbeknownst to the gang, the parents of one of the girls live nearby...
Despondent over the closing of his karate school, Cobra Kai teacher John Kreese joins a ruthless businessman and martial artist to get revenge on Daniel and Mr. Miyagi.
Steele is ex-cop and Vietnam vet who is determined to bring down Kwan, former South Vietnamese general and now rich and powerful drug lord.